Commit: 925ff8a127730e877d3cf2f1e5672ee218b41a45
Author: Alexander Gavrilov
Date:   Sun Jan 3 23:40:44 2021 +0300
Branches: temp-angavrilov-constraints
https://developer.blender.org/rB925ff8a127730e877d3cf2f1e5672ee218b41a45

Bone Overlay: support bone wireframe opacity settings.

When weight painting the bone overlay is extremely intrusive,
effectively requiring either extensive use of hiding individual
bones, or disabling the whole bone overlay between selections.

This addresses the issue by adding two bone opacity sliders that
are used for the 'wireframe' armature drawing mode. One directly
controls the opacity in a uniform way. The other one allows fade
based on the depth between the near and far clip planes in order
to provide an automatic visual cue about which bones are closest.

===================================================================

M       release/scripts/startup/bl_ui/space_view3d.py
M       source/blender/blenloader/intern/versioning_300.c
M       source/blender/draw/CMakeLists.txt
M       source/blender/draw/engines/overlay/overlay_armature.c
M       source/blender/draw/engines/overlay/overlay_private.h
M       source/blender/draw/engines/overlay/overlay_shader.c
A       source/blender/draw/engines/overlay/shaders/armature_alpha_lib.glsl
M       source/blender/draw/engines/overlay/shaders/armature_dof_solid_frag.glsl
M       
source/blender/draw/engines/overlay/shaders/armature_envelope_solid_frag.glsl
M       
source/blender/draw/engines/overlay/shaders/armature_shape_solid_frag.glsl
M       
source/blender/draw/engines/overlay/shaders/armature_sphere_solid_frag.glsl
M       source/blender/draw/engines/overlay/shaders/armature_stick_frag.glsl
M       source/blender/draw/engines/overlay/shaders/armature_wire_frag.glsl
M       source/blender/makesdna/DNA_view3d_defaults.h
M       source/blender/makesdna/DNA_view3d_types.h
M       source/blender/makesrna/intern/rna_space.c

===================================================================

diff --git a/release/scripts/startup/bl_ui/space_view3d.py 
b/release/scripts/startup/bl_ui/space_view3d.py
index 4b06a2df3a0..b0a539a5142 100644
--- a/release/scripts/startup/bl_ui/space_view3d.py
+++ b/release/scripts/startup/bl_ui/space_view3d.py
@@ -6561,17 +6561,18 @@ class VIEW3D_PT_overlay_sculpt(Panel):
         row.prop(overlay, "sculpt_mode_face_sets_opacity", text="Face Sets")
 
 
-class VIEW3D_PT_overlay_pose(Panel):
+class VIEW3D_PT_overlay_bones(Panel):
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'HEADER'
     bl_parent_id = 'VIEW3D_PT_overlay'
-    bl_label = "Pose Mode"
+    bl_label = "Bones"
 
     @classmethod
     def poll(cls, context):
         mode = context.mode
         return (
             (mode == 'POSE') or
+            (mode == 'EDIT_ARMATURE') or
             (mode == 'PAINT_WEIGHT' and context.pose_object)
         )
 
@@ -6591,10 +6592,14 @@ class VIEW3D_PT_overlay_pose(Panel):
             sub = row.row()
             sub.active = display_all and overlay.show_xray_bone
             sub.prop(overlay, "xray_alpha_bone", text="Fade Geometry")
-        else:
+        elif mode == 'PAINT_WEIGHT':
             row = col.row()
             row.prop(overlay, "show_xray_bone")
 
+        row = col.row()
+        row.prop(overlay, "bone_wire_alpha")
+        row.prop(overlay, "bone_wire_fade")
+
 
 class VIEW3D_PT_overlay_texture_paint(Panel):
     bl_space_type = 'VIEW_3D'
@@ -7766,7 +7771,7 @@ classes = (
     VIEW3D_PT_overlay_texture_paint,
     VIEW3D_PT_overlay_vertex_paint,
     VIEW3D_PT_overlay_weight_paint,
-    VIEW3D_PT_overlay_pose,
+    VIEW3D_PT_overlay_bones,
     VIEW3D_PT_overlay_sculpt,
     VIEW3D_PT_snapping,
     VIEW3D_PT_proportional_edit,
diff --git a/source/blender/blenloader/intern/versioning_300.c 
b/source/blender/blenloader/intern/versioning_300.c
index 371ee364f20..4b1ea9b2217 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -29,6 +29,8 @@
 #include "DNA_brush_types.h"
 #include "DNA_genfile.h"
 #include "DNA_modifier_types.h"
+#include "DNA_screen_types.h"
+#include "DNA_space_types.h"
 #include "DNA_text_types.h"
 
 #include "BKE_lib_id.h"
@@ -137,5 +139,19 @@ void blo_do_versions_300(FileData *fd, Library 
*UNUSED(lib), Main *bmain)
         }
       }
     }
+
+    /* Initialize the bone wireframe opacity setting. */
+    if (!DNA_struct_elem_find(fd->filesdna, "View3DOverlay", "float", 
"bone_wire_alpha")) {
+      for (bScreen *screen = bmain->screens.first; screen; screen = 
screen->id.next) {
+        LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
+          LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
+            if (sl->spacetype == SPACE_VIEW3D) {
+              View3D *v3d = (View3D *)sl;
+              v3d->overlay.bone_wire_alpha = 1.0f;
+            }
+          }
+        }
+      }
+    }
   }
 }
diff --git a/source/blender/draw/CMakeLists.txt 
b/source/blender/draw/CMakeLists.txt
index 196b46953c4..1126016ebe7 100644
--- a/source/blender/draw/CMakeLists.txt
+++ b/source/blender/draw/CMakeLists.txt
@@ -349,6 +349,7 @@ data_to_c_simple(engines/basic/shaders/depth_frag.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/common_overlay_lib.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/antialiasing_frag.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/antialiasing_vert.glsl SRC)
+data_to_c_simple(engines/overlay/shaders/armature_alpha_lib.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_dof_vert.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_dof_solid_frag.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_envelope_outline_vert.glsl 
SRC)
diff --git a/source/blender/draw/engines/overlay/overlay_armature.c 
b/source/blender/draw/engines/overlay/overlay_armature.c
index 4db3db58317..ed95a498915 100644
--- a/source/blender/draw/engines/overlay/overlay_armature.c
+++ b/source/blender/draw/engines/overlay/overlay_armature.c
@@ -139,6 +139,11 @@ void OVERLAY_armature_cache_init(OVERLAY_Data *vedata)
                                    draw_ctx->object_pose != NULL;
   DRWState state;
 
+  const float wire_alpha = pd->overlay.bone_wire_alpha;
+  const float wire_fade_fac = pd->overlay.bone_wire_fade;
+  const float wire_fade = wire_fade_fac ? expf((wire_fade_fac - 0.5f) * 8) : 0;
+  const bool use_wire_alpha = (wire_alpha < 1.0f || wire_fade > 0.0f);
+
   if (pd->armature.do_pose_fade_geom) {
     state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_EQUAL | 
DRW_STATE_BLEND_ALPHA;
     DRW_PASS_CREATE(psl->armature_bone_select_ps, state | pd->clipping_state);
@@ -162,8 +167,8 @@ void OVERLAY_armature_cache_init(OVERLAY_Data *vedata)
     OVERLAY_InstanceFormats *formats = OVERLAY_shader_instance_formats_get();
     OVERLAY_ArmatureCallBuffers *cb = &pd->armature_call_buffers[i];
 
-    cb->custom_shapes_ghash = BLI_ghash_ptr_new(__func__);
-    cb->custom_shapes_transp_ghash = BLI_ghash_ptr_new(__func__);
+    cb->solid.custom_shapes_ghash = BLI_ghash_ptr_new(__func__);
+    cb->transp.custom_shapes_ghash = BLI_ghash_ptr_new(__func__);
 
     DRWPass **p_armature_ps = &psl->armature_ps[i];
     DRWState infront_state = (DRW_state_is_select() && (i == 1)) ? 
DRW_STATE_IN_FRONT_SELECT : 0;
@@ -186,45 +191,86 @@ void OVERLAY_armature_cache_init(OVERLAY_Data *vedata)
       sh = OVERLAY_shader_armature_sphere(false);
       grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
-      DRW_shgroup_uniform_float_copy(grp, "alpha", 1.0f);
-      cb->point_solid = BUF_INSTANCE(grp, format, DRW_cache_bone_point_get());
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){1.0f, 0.0f});
+      cb->solid.point_fill = BUF_INSTANCE(grp, format, 
DRW_cache_bone_point_get());
 
       grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_state_disable(grp, DRW_STATE_WRITE_DEPTH);
       DRW_shgroup_state_enable(grp, DRW_STATE_BLEND_ALPHA);
-      DRW_shgroup_uniform_float_copy(grp, "alpha", 0.4f);
-      cb->point_transp = BUF_INSTANCE(grp, format, DRW_cache_bone_point_get());
+      DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){wire_alpha * 
0.4f, wire_fade});
+      cb->transp.point_fill = BUF_INSTANCE(grp, format, 
DRW_cache_bone_point_get());
 
       sh = OVERLAY_shader_armature_shape(false);
       grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
-      DRW_shgroup_uniform_float_copy(grp, "alpha", 1.0f);
-      cb->custom_solid = grp;
-      cb->box_solid = BUF_INSTANCE(grp, format, DRW_cache_bone_box_get());
-      cb->octa_solid = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_get());
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){1.0f, 0.0f});
+      cb->solid.custom_fill = grp;
+      cb->solid.box_fill = BUF_INSTANCE(grp, format, DRW_cache_bone_box_get());
+      cb->solid.octa_fill = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_get());
 
       grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_state_disable(grp, DRW_STATE_WRITE_DEPTH);
       DRW_shgroup_state_enable(grp, DRW_STATE_BLEND_ALPHA);
-      DRW_shgroup_uniform_float_copy(grp, "alpha", 0.6f);
-      cb->custom_transp = grp;
-      cb->box_transp = BUF_INSTANCE(grp, format, DRW_cache_bone_box_get());
-      cb->octa_transp = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_get());
+      DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){wire_alpha * 
0.6f, wire_fade});
+      cb->transp.custom_fill = grp;
+      cb->transp.box_fill = BUF_INSTANCE(grp, format, 
DRW_cache_bone_box_get());
+      cb->transp.octa_fill = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_get());
 
       sh = OVERLAY_shader_armature_sphere(true);
       grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
-      cb->point_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_point_wire_outline_get());
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){1.0f, 0.0f});
+      cb->solid.point_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_point_wire_outline_get());
+
+      if (use_wire_alpha) {
+        grp = DRW_shgroup_create(sh, armature_ps);
+        DRW_shgroup_state_enable(grp, DRW_STATE_BLEND_ALPHA);
+        DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+        DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){wire_alpha, 
wire_fade});
+        cb->transp.point_outline = BUF_INSTANCE(
+            grp, format, DRW_cache_bone_point_wire_outline_get());
+      }
+      else {
+        cb->transp.point_outline = cb->solid.point_outline;
+      }
 
       sh = OVERLAY_shader_armature_shape(true);
-      cb->custom_outline = grp = DRW_shgroup_create(sh, armature_ps);
+      cb->solid.custom_outline = grp = DRW_shgroup_create(sh, armature_ps);
       DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
-      cb->box_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_box_wire_get());
-      cb->octa_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_wire_get());
+      DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){1.0f, 0.0f});
+      cb->solid.box_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_box_wire_get());
+      cb->solid.octa_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_wire_get());
+
+      if (use_wire_alpha) {
+        cb->transp.custom_outline = grp = DRW_shgroup_create(sh, armature_ps);
+        DRW_shgroup_state_enable(grp, DRW_STATE_BLEND_ALPHA);
+        DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+        DRW_shgroup_uniform_vec2_copy(grp, "wireAlpha", (float[2]){wire_alpha, 
wire_fade});
+        cb->transp.box_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_box_wire_get());
+        cb->transp.octa_outline = BUF_INSTANCE(grp, format, 
DRW_cache_bone_octahedral_wire_get());
+      }
+      else {
+        cb->transp.custom_outline = cb->solid.custom_outline;
+        c

@@ Diff output truncated at 10240 characters. @@

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